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Question

A parallel beam of light is incident on the upper part of a prism of angle 1.8° and R.I. 3/2. The light coming out of the prism falls on a concave mirror of radius of curvature 20 cm. The distance of the point (where the rays are focused after reflection from the mirror) from the principal axis is :

  1. 9 cm    
  2. 0.157 cm    
  3. 0.314 cm    
  4. None of these    

The correct answer is: 0.157 cm

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